12121311031 has 4 divisors (see below), whose sum is σ = 12124072152. Its totient is φ = 12118549912.

The previous prime is 12121310969. The next prime is 12121311113. The reversal of 12121311031 is 13011312121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13011312121 = 75389 ⋅172589.

It is a cyclic number.

It is not a de Polignac number, because 12121311031 - 2²¹ = 12119213879 is a prime.

It is a super-2 number, since 2×12121311031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121310996 and 12121311014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121311131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1373965 + ... + 1382758.

It is an arithmetic number, because the mean of its divisors is an integer number (3031018038).

Almost surely, 2^12121311031 is an apocalyptic number.

12121311031 is a deficient number, since it is larger than the sum of its proper divisors (2761121).

12121311031 is an equidigital number, since it uses as much as digits as its factorization.

12121311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761120.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 12121311031 its reverse (13011312121), we get a palindrome (25132623152).

The spelling of 12121311031 in words is "twelve billion, one hundred twenty-one million, three hundred eleven thousand, thirty-one".